Wow and flutter

Wow and flutter describe two related types of unwanted speed variation in a turntable's rotation, wow being a slower, more gradual wavering and flutter being faster, more rapid fluctuation. Both cause the pitch of the music to waver slightly rather than staying perfectly steady.

These fluctuations usually come from mechanical imperfections such as an uneven belt, a worn or off-center bearing, or motor irregularities, and they tend to be most audible on sustained notes like piano, held vocals, or long synthesizer tones, where a steady pitch makes any wavering easy to notice. Well engineered turntables, whether belt or direct drive, are built specifically to minimize both effects to levels most listeners cannot detect.

If a turntable's pitch sounds like it drifts or wavers noticeably, particularly on sustained notes, that often points toward a belt problem, bearing wear, or a fundamentally lower quality motor and drive system rather than something adjustable in normal setup. Comparing higher quality turntables against budget ones on a familiar, sustained piano or vocal track is one of the more reliable ways to hear a real difference. A common misconception is blaming wow and flutter issues on the cartridge or phono preamp, when the root cause is almost always the platter's rotational stability itself.